What is the PO4
in the tank? Posting all other params may help us aid you as well. What is the turnover/flow of the system(total gph
)? Do you have a skimmer? How often/much do you feed and what? What salt mix do you use?
Manual removal, and keeping NO3
low and PO4
below .03 meg/l will cure algae. You may want to consider running a PO4
/silicate reducer like Rowaphos or Phosban. Both work very well at lowering nutrients and reducing algae outbreaks. Cutting your lights off for a few days helps to bring it under control while other measures are taken to prevent it from returning. Scrubbing the rock and rinsing it in clean SW
helped me a lot. Removing the detritus, etc. seems to help slow algae from returning. If there is a ton of nutrients locked in the rock and sand from using bad water or it was collected from a dirty area, you may need to look into "cooking" it to remove the excess nutrients. That is pretty laborious and requires a good amount of new SW
, but it may be easier than replacing it or dealing w/ algae for the life of the tank.